Hello Kathryn,
Disney's BoardWalk Inn is a beautiful resort hotel and one of my favorites. The location is perfect, nestled between Epcot and Disney's Hollywood Studios, and the ambience offers a sophisticated but warm and inviting charm. I'm confident you will love it, too!
Disney's Magical Express policies state any flight arriving after 10:00 p.m. will require guests to collect and travel with their luggage. Once you collect your luggage at baggage claim, it can be easily stowed underneath the coach bus. The ride to your resort will only be about 35 minutes or so but there could be other stops. I would estimate your arrival to be somewhere between 11:30 and 12:00, but this could fluctuate based on wait times for your luggage, potential flight delays, etc. It's always hard to predict an exact time but Disney will do their best to get you to your resort as quickly as possible.
Feel free to ask me any further questions about your travel plans, Kathryn. I've used Disney's Magical Express dozens of times and love its convenience!
Best wishes for a magical vacation,
Sherri